Dota Allstars:
Once a noble knight protecting his kingdom, the man was thrown into Hell, where he was ripped apart over and over for centuries. Now, Lucifer has thrown him back onto the soil, corrupted and mindless, as King Leoric, the Skeleton King. He marches on, leading his minions with an unfaltering gaze, knowing only one thing: the orders given to him by the dark lord himself. Able to cripple his opponents by drawing power from the fiery depths of hell itself, King Leoric is a major threat on the battlefield. His mighty blade allows him and others in his presence to drain the blood of their enemies. It is said that he is unkillable, and those who are struck down by his hellfire don't wake up again. Dota 2:
The victim of a longevity spell that backfired, the Skeleton King Ostarion has built an empire from the bones of his enemies. He lives only to extend his reach, for as long as he is perpetually building and adding to his domain he cannot die. The walls of his palace are formed of fired bone; the streets are paved with bones of every sort of creature and every enemy; and even the wood and other natural features of his land have been swept away and replaced with replicas formed of bone. From the Ivory Forest to Ostarion's towering Throne of Bone, nothing happens in the Empire of Bones without the full knowledge of its Skeleton King.

Despite having only one active skill, Wraith King requires some mana management. Using Wraithfire Blast to harass an enemy will cause you to run almost completely out of mana, which can be very costly if you don't have enough to use it at a better time.

Vampiric Aura, while giving sustain, also pushes your creeps forward, as it grants your creeps lifesteal as well. Because of this, it is wiser to invest points into other skills before learning it.

Reincarnation requires mana to activate, meaning that you won't revive if you are low on mana when you die. Keep this in mind when fighting and when making decisions about when to use Wraithfire Blast.